CN115692882B - Online repairing and balancing control method and device for storage battery pack - Google Patents
Online repairing and balancing control method and device for storage battery pack Download PDFInfo
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Abstract
The invention relates to a storage battery pack online repair balance control method and device, belongs to the technical field of storage batteries, and solves the problems of capacity reduction, whole group repair imbalance and the like caused by storage battery vulcanization. The method comprises the following steps: starting a special frequency constant current source static impedance test unit to apply special frequency pulse current in a time-sharing way, and synchronously collecting special frequency voltages at two ends of each single battery; obtaining the static impedance value of each single battery according to the special frequency voltage and outputting the composite pulse harmonic voltages with different amplitude frequencies according to the static impedance value of each single battery by a PWM modulation mode; applying composite pulse harmonic voltage to each single battery in a time-sharing way, and synchronously starting a dynamic composite pulse harmonic energy testing unit; and collecting composite pulse harmonic signals, counting harmonic energy of each single battery, comparing the static impedance value change rate of each single battery with the harmonic energy, and adjusting the amplitude and frequency of the composite pulse harmonic voltage. And the balanced repair of different batteries in the same battery pack is realized.
Description
Technical Field
The invention relates to the technical field of storage batteries, in particular to a storage battery pack online repairing and balancing control method and device.
Background
The failure of the lead-acid storage battery has great relation with factors such as a generation process, a use mode, environment and the like. The failure of the battery is that the internal resistance of the battery is increased due to dehydration and vulcanization, heat is generated in the charging process after the capacity of the battery is reduced, so that the dehydration and vulcanization are accelerated, the electrolyte is too high in density to a certain extent, and the electrolyte is softened, corroded and swelled until the battery is scrapped, so that the vulcanization (lead sulfate crystallization) is the root cause of the battery failure.
Reasons for battery vulcanization include the following abnormal use: high-current discharge, low-current deep discharge, untimely charging, long-term rest and no discharge under long-time floating charge conditions.
Lead sulfate can be formed in electrolyte when the lead-acid storage battery works in a discharging state, crystallization can occur when the concentration of the lead sulfate reaches a certain threshold value, and the crystallized lead sulfate can not participate in a circulating reaction any more, so that the capacity of the lead-acid storage battery is reduced.
At present, the common method is high-frequency resonance repair, namely, resonance is generated between high-frequency resonance current and vulcanized lead sulfate crystals, so that the lead sulfate crystals are broken, the lead sulfate crystals can participate in a circulating reaction again, and the aim of recovering the capacity of the storage battery is finally achieved.
However, in the existing online repair technology, in the repair process, a whole group of storage batteries is adopted for repair, and each group of batteries comprises a plurality of single batteries; the existing storage battery vulcanization repair technology cannot fully consider and meet the problems of all series working batteries when in online operation. The common storage battery online repair technology cannot enable all the single batteries of the series battery pack to obtain equal energy, generally has a certain effect on a plurality of single batteries at two ends of the battery pack with more single batteries connected in series, but has an unobvious effect on the rest single batteries (particularly the single batteries at the middle part), and cannot improve the balance characteristic of the storage battery pack most effectively, and in the same way, the pulse harmonic energy applied in the series repair process is the same, but the internal resistances of the storage batteries caused by lead sulfate crystallization are not consistent, so that in the whole battery pack, some repair energy is insufficient, and some excessive repair phenomena exist, and the final result is that: the local battery of the whole battery fails, so that the whole battery cannot work normally, and the meaning and effect of battery repair are lost.
Disclosure of Invention
In view of the above analysis, the embodiment of the invention aims to provide a method and a device for controlling the on-line repair and equalization of a storage battery pack, which are used for solving the problems of capacity reduction, unbalanced repair of the whole pack and the like caused by vulcanization of the storage battery.
In one aspect, an embodiment of the present invention provides a method for controlling online repair and equalization of a storage battery, including: starting a special frequency constant current source static impedance test unit to apply special frequency pulse current to each single battery in the storage battery pack in a time-sharing way, and synchronously collecting special frequency voltages at two ends of each single battery in the storage battery pack; the core control unit obtains the static impedance value of each single battery according to the special frequency voltage and outputs the composite pulse harmonic voltage with different amplitude frequencies in a PWM modulation mode according to the static impedance value of each single battery; applying the composite pulse harmonic voltage to each single battery in a time-sharing manner to repair each single battery, and synchronously starting a dynamic composite pulse harmonic energy testing unit; and collecting composite pulse harmonic signals at two ends of each single battery, and counting the harmonic energy of each single battery in the repairing period in a discrete integration mode, wherein the static impedance value change rate of each single battery is compared with the harmonic energy of each single battery in the repairing period, and the amplitude and the frequency of the composite pulse harmonic voltage are adjusted to repair the battery in the next period.
The beneficial effects of the technical scheme are as follows: the special frequency constant current source static impedance test unit realizes static impedance test of the single battery, and according to the test result of the static impedance, different impedance empirical values are referred, and composite pulse harmonic waves with different current energy are applied by the composite pulse harmonic wave repair unit to repair the vulcanization problem of the battery, and synchronously, the dynamic composite pulse harmonic wave energy test unit measures the composite harmonic wave charge energy in a repair time period; after a repair period, a special-frequency constant current source static impedance test unit is further started to perform static impedance test, composite pulse harmonic energy of different current units is adjusted according to new test results of static impedance and dynamic composite pulse harmonic energy comprehensive analysis, the steps are repeated, and balanced repair of different single batteries in the same battery pack is finally achieved through the above closed-loop working process.
Based on a further improvement of the method, comparing the static impedance value change rate of each single battery with the harmonic energy of each single battery in the repairing period, and adjusting the amplitude and the frequency of the composite pulse harmonic voltage comprises: the amplitude and the frequency of the composite pulse harmonic voltage are adjusted according to the change rate of the static impedance value of each single battery in the storage battery pack in the repairing period in the following way, wherein when the change rate of the static impedance value is large and is close to the static impedance value of a normal battery, the amplitude and the frequency of the composite pulse harmonic voltage are reduced; and increasing the amplitude and frequency of the composite pulse harmonic voltage when the static impedance value change rate is small and greater than the static impedance value of a normal battery.
Based on the further improvement of the method, after a certain repair period, the static impedance value of each single battery in the storage battery pack is consistent, the low-amplitude composite pulse harmonic voltage is continuously applied to each single battery in a time-sharing mode, the occurrence of lead sulfate recrystallization of each single battery is avoided, and the performance consistency of each single battery in the storage battery pack is ensured.
On the other hand, the embodiment of the invention provides an on-line repairing and balancing control device for a storage battery pack, which comprises the following steps: the special frequency constant current source static impedance testing unit is used for applying special frequency pulse current to each single battery in the storage battery pack in a time-sharing way and synchronously collecting special frequency voltages at two ends of each single battery in the storage battery pack; the core control unit is used for starting the special frequency constant current source static impedance testing unit, obtaining the static impedance value of each single battery according to the special frequency voltage and outputting composite pulse harmonic voltages with different amplitude frequencies according to the static impedance value of each single battery in a PWM modulation mode; the composite pulse harmonic wave repairing unit is used for applying the composite pulse harmonic wave voltage to each single battery in a time-sharing manner so as to repair each single battery, and synchronously starting the dynamic composite pulse harmonic wave energy testing unit; the core control unit is further used for comparing the static impedance value change rate of each single battery with the harmonic energy of each single battery in the repairing period of the section, adjusting the amplitude and the frequency of the composite pulse harmonic voltage and repairing the battery of the next period.
Based on further improvement of the device, the special-frequency constant current source static impedance testing unit comprises a special-frequency constant current source module and a band-pass operational amplifier module, wherein a first output end and a second output end of the special-frequency constant current source module are respectively connected with a first input end and a second input end of the band-pass operational amplifier module, and the first output end of the special-frequency constant current source module and the first input end of the band-pass operational amplifier module are connected with positive poles of all single batteries in the storage battery pack through a first group of electronic switches; and the second output end of the special frequency constant current source module and the second input end of the band-pass operational amplifier module are connected with the cathodes of all the single batteries in the storage battery pack through a second group of electronic switches, and the positive electrode side electronic switches in the first group of electronic switches are in one-to-one correspondence with the negative electrode side electronic switches in the second group of electronic switches.
Based on the further improvement of the device, the special frequency constant current source module comprises a constant current source and a switching transistor, wherein the positive electrode of the constant current source is connected to the source electrode of the switching transistor, and the negative electrode of the constant current source is used as the second output end of the special frequency constant current source module and is used for generating current with specific amplitude and specific frequency; and the grid electrode of the switching transistor is connected with the core control unit, and the drain electrode of the switching transistor is used as the first output end of the special frequency constant current source module, wherein the switching transistor is turned on or off according to a pulse control signal received by the grid electrode, so that the switching transistor generates special frequency pulse current.
Based on a further improvement of the device, the band-pass operational amplifier module comprises a band-pass filter and a first operational amplifier, wherein the band-pass filter is used for allowing the special frequency voltage to pass and shielding other frequency band voltages; and the first operational amplifier is used for amplifying the turbo frequency voltage and providing the amplified turbo frequency voltage to the core control unit.
Based on the further improvement of the device, the core control unit is used for calculating the static impedance value of each single battery in the storage battery pack according to the special frequency voltage and the special frequency pulse current, generating composite pulse harmonic voltages with different frequency voltage amplitudes according to the change rate of the static impedance value in the repairing period through a PWM modulation mode and outputting the composite pulse harmonic voltages to the composite pulse harmonic repairing unit, wherein when the change rate of the static impedance value is large and is close to the static impedance value of a normal battery, the amplitude and the frequency of the composite pulse harmonic voltages are reduced; and increasing the amplitude and frequency of the composite pulse harmonic voltage when the static impedance value change rate is small and greater than the static impedance value of a normal battery.
Based on the further improvement of the device, the composite pulse harmonic wave repairing unit comprises a second operational amplifier, a first group of repairing switches, a second group of repairing switches corresponding to the first group of repairing switches and a sampling resistor, wherein the second operational amplifier is used for amplifying the composite pulse harmonic wave voltage; each single cell in the storage battery pack is connected in series between the second operational amplifier and the sampling resistor in a time-sharing manner via the first group of repair switches and the second group of repair switches to time-share apply an amplified composite pulse harmonic voltage to each single cell, wherein the positive electrode side repair switches in the first group of repair switches and the negative electrode side repair switches in the second group of repair switches are in one-to-one correspondence.
Based on the further improvement of the device, the dynamic composite pulse harmonic energy testing unit is used for measuring the dynamic pulse harmonic current value applied to each single battery, and carrying out integral amplification on the dynamic pulse harmonic current value and converting the dynamic pulse harmonic current value into a dynamic pulse harmonic voltage value; the core control unit is further used for calculating current effective values of all points of the dynamic pulse harmonic according to the dynamic pulse harmonic voltage value and the sampling resistor, and carrying out integral calculation on the current effective values to obtain the harmonic energy of the dynamic pulse harmonic applied at this time; in the repairing period, after a fixed time interval is passed, dynamic pulse harmonic waves are applied for a plurality of times to repair each single battery, and after the set repairing period time is reached, harmonic energy of each single battery of the dynamic pulse harmonic waves applied for a plurality of times in the repairing period is summed up again, so that the total harmonic energy of each single battery in the repairing period is obtained; and acquiring the special frequency voltage at the two ends of each single battery again according to the special frequency constant current source static impedance test unit, and acquiring the static impedance value of each single battery after one repair period according to the acquired special frequency voltage so as to calculate the change rate of the static impedance value of each single battery after one repair period.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. the special frequency constant current source static impedance test unit realizes static impedance test of the single battery, and according to the test result of the static impedance, different impedance empirical values are referred, and composite pulse harmonic waves with different current energy are applied by the composite pulse harmonic wave repair unit to repair the vulcanization problem of the battery, and synchronously, the dynamic composite pulse harmonic wave energy test unit measures the composite harmonic wave charge energy in a repair time period; after a repair period, a special-frequency constant current source static impedance test unit is further started to perform static impedance test, composite pulse harmonic energy of different current units is adjusted according to new test results of static impedance and dynamic composite pulse harmonic energy comprehensive analysis, the steps are repeated, and balanced repair of different single batteries of the same battery pack is finally achieved through the closed-loop working process.
2. In the serial repair process, according to different crystallization degrees of lead sulfate, the internal resistances caused by the different crystallization degrees are inconsistent, and the pulse harmonic energy applied by a control circuit is different, so that the excessive repair of low-crystallization single batteries is avoided, and other elements (polar plates) of the single batteries are damaged or enlarged; meanwhile, the phenomenon that lead sulfate crystals cannot be broken due to insufficient pulse harmonic energy is avoided, and the design effect cannot be achieved. The on-line repairing and balancing control device for the storage battery pack truly realizes the balanced repairing of different single batteries, and simultaneously realizes reasonable control of energy and avoids excessive energy consumption.
3. After certain repair period, the impedance of each single battery of the whole battery pack tends to be consistent, and the control circuit continuously and time-divisionally applies low-amplitude composite pulse harmonic energy to each single battery, so that the occurrence of lead sulfate recrystallization of each single battery is avoided, the performance consistency and the uniformity of the whole battery pack are ensured, and the reduction of the service life of the battery due to lead sulfate crystallization is avoided.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
Fig. 1 is a block diagram of a battery pack online repair equalization control device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a specific-frequency constant-current source static impedance test unit of the storage battery pack online repair balance control device according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a composite pulse harmonic representative feature of a battery pack online repair equalization control device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a composite pulse harmonic repairing unit of a storage battery pack online repairing balance control device according to an embodiment of the invention;
FIG. 5 is a schematic diagram of a portion of a circuit of a dynamic composite pulse harmonic energy testing unit of a battery pack online repair equalization control device according to an embodiment of the present invention;
fig. 6 is a specific flowchart of a method for controlling on-line repair equalization of a battery pack according to an embodiment of the present invention; and
fig. 7 is a basic flowchart of a battery pack online repair equalization control method according to an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
Referring to fig. 7, in one embodiment of the present invention, a method for controlling on-line repair and equalization of a storage battery pack is disclosed, comprising: in step S702, a specific frequency constant current source static impedance testing unit is started to apply a specific frequency pulse current to each single battery in the storage battery in a time-sharing manner, and synchronously collect specific frequency voltages at two ends of each single battery in the storage battery; in step S704, the core control unit obtains the static impedance value of each single battery according to the special frequency voltage and outputs the composite pulse harmonic voltage with different amplitude frequencies according to the static impedance value of each single battery by PWM modulation; in step S706, a composite pulse harmonic voltage is applied to each unit cell in a time-sharing manner to repair each unit cell, and a dynamic composite pulse harmonic energy testing unit is synchronously started; and in step S708, the composite pulse harmonic signals at two ends of each single battery are collected, and the harmonic energy of each single battery in the repairing period is counted in a discrete integration mode, wherein the static impedance value change rate of each single battery is compared with the harmonic energy of each single battery in the repairing period, and the amplitude and frequency of the composite pulse harmonic voltage are adjusted to repair the battery in the next period.
Compared with the prior art, in the on-line repair and equalization control method for the storage battery pack, the special-frequency constant-current source static impedance test unit is used for realizing static impedance test of the single battery, and according to test results of the static impedance, different impedance empirical values are referred to, composite pulse harmonic waves with different current energy are applied by the composite pulse harmonic wave repair unit to repair the vulcanization problem of the battery, and synchronously, the composite harmonic wave charge energy in a repair time period is measured by the dynamic composite pulse harmonic wave energy test unit; after a repair period, a special-frequency constant current source static impedance test unit is further started to perform static impedance test, composite pulse harmonic energy of different current units is adjusted according to new test results of static impedance and dynamic composite pulse harmonic energy comprehensive analysis, the steps are repeated, and balanced repair of different single batteries in the same battery pack is finally achieved through the above closed-loop working process.
Hereinafter, each step of the battery pack online repair equalization control method according to the embodiment of the present invention will be described in detail with reference to fig. 7.
In step S702, the specific frequency constant current source static impedance testing unit is started to apply specific frequency pulse current to each single battery in the battery pack in a time-sharing manner, and synchronously collect specific frequency voltages at two ends of each single battery in the battery pack.
In step S704, the core control unit obtains the static impedance value of each single battery according to the special frequency voltage and outputs the composite pulse harmonic voltages with different amplitude frequencies according to the static impedance value of each single battery by PWM modulation.
In step S706, the composite pulse harmonic voltage is applied to each unit cell in a time-sharing manner to repair each unit cell, and the dynamic composite pulse harmonic energy test unit is started synchronously.
In step S708, composite pulse harmonic signals at two ends of each single battery are collected, and harmonic energy of each single battery in the repairing period is counted in a discrete integration mode, wherein the static impedance value change rate of each single battery is compared with the harmonic energy of each single battery in the repairing period, and the amplitude and frequency of the composite pulse harmonic voltage are adjusted to repair the battery in the next period.
Specifically, comparing the change rate of the static impedance value of each single battery with the harmonic energy of each single battery in the repairing period, and adjusting the amplitude and the frequency of the composite pulse harmonic voltage comprises: according to the change rate of the static impedance value of each single battery in the storage battery pack in the repairing period, the amplitude and the frequency of the composite pulse harmonic voltage are adjusted in the following mode, wherein when the change rate of the static impedance value is large and is close to the static impedance value of a normal battery, the amplitude and the frequency of the composite pulse harmonic voltage are reduced; and increasing the amplitude and frequency of the composite pulse harmonic voltage when the static impedance value change rate is small and is larger than the static impedance value of the normal battery.
After a certain repair period, the static impedance value of each single battery in the storage battery pack is consistent, and then the low-amplitude composite pulse harmonic voltage is continuously applied to each single battery in a time-sharing way, so that the occurrence of lead sulfate recrystallization of each single battery is avoided, and the performance consistency of each single battery in the storage battery pack is ensured.
Referring to fig. 1, another embodiment of the present invention discloses an on-line repair equalization control device for a storage battery pack, including: the device comprises an abnormal frequency constant current source static impedance testing unit 100, a core control unit 110, a composite pulse harmonic repairing unit 120 and a dynamic composite pulse harmonic energy testing unit 130.
The special frequency constant current source static impedance testing unit 100 is used for applying special frequency pulse current to each single battery in the storage battery pack in a time-sharing manner and synchronously collecting special frequency voltages at two ends of each single battery in the storage battery pack;
referring to fig. 2, the specific-frequency constant current source static impedance testing unit 100 includes a specific-frequency constant current source module 101 and a band-pass operational amplifier module 102, wherein a first output end and a second output end of the specific-frequency constant current source module 101 are respectively connected with a first input end and a second input end of the band-pass operational amplifier module 102, and the first output end of the specific-frequency constant current source module 101 and the first input end of the band-pass operational amplifier module 102 are connected with positive poles of each single battery in the storage battery pack via a first group of electronic switches; and the second output end of the special frequency constant current source module 101 and the second input end of the band-pass operational amplifier module 102 are connected with the cathodes of all the single batteries in the storage battery via a second group of electronic switches, and the positive electrode side electronic switches KR1+, KR2+, KR3+, KR4+, KR5+ and KR6+ in the first group of electronic switches are in one-to-one correspondence with the negative electrode side electronic switches KR1-, KR2-, KR3-, KR4-, KR 5-and KR 6-in the second group of electronic switches.
The special frequency constant current source module 101 includes a constant current source and a switching transistor. Specifically, the positive electrode of the constant current source is connected to the source of the switching transistor, and the negative electrode of the constant current source is used as the second output end of the special frequency constant current source module, and is used for generating a current with specific amplitude and frequency, for example, 1.5A,220Hz. The grid of the switching transistor is connected with the core control unit, and the drain electrode of the switching transistor is used as a first output end of the special frequency constant current source module, wherein the switching transistor is turned on or off according to a pulse control signal received by the grid, so that the switching transistor generates special frequency pulse current. The band pass operational amplifier module 102 includes a band pass filter BPF and a first operational amplifier OPA. The band-pass filter BPF is used for allowing the special frequency voltage to pass and shielding other frequency band voltages; and a first operational amplifier OPA for amplifying the turbo voltage and providing the amplified turbo voltage to the core control unit 110.
The core control unit 110 is configured to start the specific frequency constant current source static impedance testing unit, obtain the static impedance value of each unit cell according to the specific frequency voltage, and output the composite pulse harmonic voltages with different amplitude frequencies according to the static impedance value of each unit cell by using a PWM modulation mode. Specifically, the core control unit 110 is configured to calculate a static impedance value of each unit cell in the battery pack according to the turbo voltage and turbo pulse current, and generate composite pulse harmonic voltages with different frequency voltage amplitudes according to a change rate of the static impedance value in the repair period by means of PWM modulation, and output the composite pulse harmonic voltages to the composite pulse harmonic repair unit 120. When the change rate of the static impedance value is large and is close to the static impedance value of a normal battery, the amplitude and the frequency of the composite pulse harmonic voltage are reduced; and increasing the amplitude and frequency of the composite pulse harmonic voltage when the static impedance value change rate is small and is larger than the static impedance value of the normal battery.
The composite pulse harmonic repairing unit 120 is configured to apply a composite pulse harmonic voltage to each unit cell in a time-sharing manner to repair each unit cell, and synchronously start the dynamic composite pulse harmonic energy testing unit. Referring to fig. 4, the composite pulse harmonic repairing unit 120 includes a second operational amplifier PA, a first group of repairing switches k1+, k2+, k3+, k4+, k5+ and k6+, a second group of repairing switches K1-, K2-, K3-, K4-, K5-and K6 corresponding to the first group of repairing switches, and a sampling resistor Rf. The second operational amplifier PA is used for amplifying the composite pulse harmonic voltage PWM. Each cell in the battery pack is time-division serially connected between the second operational amplifier PA and the sampling resistor Rf via a first group of repair switches and a second group of repair switches to time-division apply an amplified composite pulse harmonic voltage to each cell, wherein positive-side repair switches k1+, k2+, k3+, k4+, k5+, and k6+ in the first group of repair switches are in one-to-one correspondence with negative-side repair switches K1-, K2-, K3-, K4-, K5-, and K6 in the second group of repair switches.
The dynamic composite pulse harmonic energy testing unit 130 is configured to collect composite pulse harmonic signals at two ends of each single battery, and count the harmonic energy of each single battery in the repairing period by using a discrete integration method. Specifically, the dynamic composite pulse harmonic energy testing unit 130 is configured to measure a dynamic pulse harmonic current value If applied to each unit cell, and to integrate-amplify and convert the dynamic pulse harmonic current value into a dynamic pulse harmonic voltage value UIf. Referring to fig. 5, the dynamic composite pulse harmonic energy test unit 130 includes a first-stage integrating operational amplifier circuit and a second-stage integrating operational amplifier circuit.
The core control unit 110 is further configured to compare the static impedance value change rate of each unit cell with the harmonic energy of each unit cell in the repairing period, adjust the amplitude and frequency of the composite pulse harmonic voltage, and repair the cell in the next period. The core control unit is also used for calculating the current effective value of each point of the dynamic pulse harmonic according to the dynamic pulse harmonic voltage value and the sampling resistor, and carrying out integral calculation on the current effective value to obtain the harmonic energy of the dynamic pulse harmonic applied at this time; in the repairing period, after a fixed time interval is passed, dynamic pulse harmonic waves are applied for a plurality of times to repair each single battery, and after the set repairing period time is reached, harmonic energy of each single battery of the dynamic pulse harmonic waves applied for a plurality of times in the repairing period is summed up again, so that the total harmonic energy of each single battery in the repairing period is obtained; and acquiring the special frequency voltage at two ends of each single battery again according to the special frequency constant current source static impedance test unit, and acquiring the static impedance value of each single battery after one repair period according to the acquired special frequency voltage so as to calculate the change rate of the static impedance value of each single battery after one repair period.
Hereinafter, a device and a method for controlling on-line repair equalization of a battery pack according to an embodiment of the present invention will be described in detail by way of specific examples with reference to fig. 1 to 6.
Referring to fig. 6, the method for controlling the on-line repair and equalization of the storage battery pack comprises the following steps: in step S602, the core control unit 110 starts the specific frequency constant current source module 101 of the specific frequency constant current source static impedance testing unit 100, applies pulse specific frequency alternating current to each single battery in the whole group of batteries in a time-sharing manner, and the core control unit 110 synchronously collects specific frequency voltages at two ends of the batteries through the band-pass operational amplifier module 102, and tests to obtain the static impedance value ra of each single battery. In step S604, the core control unit 110 outputs a composite pulse harmonic wave through PWM modulation according to the static impedance ra of each unit cell in the whole group of cells measured in step S1, and the composite pulse harmonic wave repairing unit 120 time-divisionally applies composite pulse harmonic energy with different amplitude frequency characteristics to each unit cell to repair each cell. In step S606, when the composite pulse harmonic energy is applied in step S2, the core control unit 110 synchronously starts the dynamic composite pulse harmonic energy testing unit 130, collects harmonic signals at two ends of each single battery, and counts the harmonic energy of each single battery in a repair period by a discrete integration method. In step S608, the core control unit restarts the static impedance measurement of the unit cell in step S1 according to the repair operation of step S2 and step S3 in one repair cycle, to obtain a static impedance rb after the repair cycle. Further, the static impedance value change of each single body is compared with the applied harmonic energy measured in the current period, the amplitude and the frequency of the composite pulse harmonic are adjusted, and the battery repair in the next period is carried out. The steps S602-S608 are repeated, so that the impedance of the whole group of batteries is consistent, and finally, the purpose of eliminating sulfuric acid crystals of different batteries is realized.
Referring to fig. 1, the on-line repair equalization control device for a battery pack according to an embodiment of the present invention includes a specific frequency constant current source static impedance test unit 100, a core control unit 110, a composite pulse harmonic repair unit 120, and a dynamic composite pulse harmonic energy test unit 130. The special frequency constant current source static impedance test unit 100 realizes static impedance test of the single battery, and according to the test result of the static impedance, different impedance empirical values are referred to, and composite pulse harmonic waves with different current energy are applied by the composite pulse harmonic wave repair unit 120 to repair the vulcanization problem of the battery, and synchronously, the dynamic composite pulse harmonic wave energy test unit 130 measures the composite harmonic wave energy of each single battery in a time repair period; after a repair period, the special-frequency constant current source static impedance test unit 100 is further started to perform static impedance test, composite pulse harmonic energy of different single batteries is adjusted according to new test results of static impedance and comprehensive analysis of dynamic composite pulse harmonic energy test results, the steps are repeated, and balanced repair of different single batteries of the same battery pack is finally achieved through the closed loop working process.
Referring to fig. 2, the on-line repair and equalization control device for the storage battery pack comprises a special-frequency constant-current source static impedance test unit 100, which comprises a special-frequency constant-current source module 101 and a band-pass operational amplifier module 102; the special frequency constant current source module 101 comprises a constant current source, and the constant current source module is designed to output a 220HZ special frequency alternating current small signal, wherein the amplitude of the alternating current small signal Ir is 1.5A so as to reduce the interference of environment and power frequency signals on the alternating current small signal.
The band-pass operational amplifier module 102 is used for collecting a special frequency voltage signal generated by a special frequency current applied to the battery and outputting the special frequency voltage signal to the core control unit 110, so that the interference of environment and power frequency signals of a power supply on alternating current small signals is reduced; the core control unit 110 is responsible for collecting the special frequency pulse voltage generated at the two ends of each single battery by the current applied by the special frequency constant current source, and calculating the static impedance ra of each single battery; further, the measurement and collection of the static impedance of each single battery are controlled by the core control unit 110 in a time-sharing manner, so that the interference and the overall power consumption during the same step are reduced. When the core control unit 110 collects the turbo voltage, the unit cells are connected to the turbo constant current source module 101 in a time-sharing control manner to measure the static impedance respectively.
The core control unit 110 outputs harmonic signals of different frequencies and voltage amplitudes to the composite pulse harmonic repairing unit 120 through PWM according to the test result of the static impedance, and repairs the vulcanization problem of each single battery by integrating operational amplification and time-sharing application to each single battery.
The core control unit 110, when controlling the application of the composite pulse harmonic to the battery, synchronously starts the dynamic composite pulse harmonic energy test unit 130 to perform the composite pulse charge energy acquisition applied at this time. In order to effectively break up the lead sulfate crystals, the composite pulse harmonic repairing unit 120 applies a K-level pulse harmonic signal, the device applies a 7-10kHz pulse signal, and in order to identify the harmonic signal, the core control unit 110 collects the harmonic signal by adopting a sampling rate of 40K, so as to truly restore the harmonic current value applied to the lead sulfate crystals.
A dynamic composite pulse harmonic energy test unit 130 measuring a dynamic pulse harmonic current value applied to each unit cell; the core control unit 110 is used for synchronously sampling the pulse harmonic current signal at high frequency and carrying out integral operation on the current pulse current to obtain pulse harmonic energy, and further, after a time repair period, the pulse harmonic energy of each single battery in the repair period is integrated and summed again to obtain the harmonic energy value sum of each single battery in the repair period. Synchronously, after a period of time repair, the core control unit 110 restarts the specific frequency constant current source static impedance test of each single battery to obtain the static impedance rb of each single battery after a period of repair.
After the battery is repaired for a period of time, the core control unit 110 compares the static impedance change conditions of the single batteries, and adjusts the amplitude and frequency of the composite pulse harmonic voltage applied in the next repair period of time according to the reverse ratio characteristic. The reverse ratio characteristics include: the static impedance is changed greatly and is close to that of a normal battery, so that the amplitude of the composite pulse harmonic voltage is reduced; the static impedance change is small, the impedance is larger than that of a normal battery, and the amplitude of the composite pulse harmonic voltage is increased.
Each cell was repeatedly subjected to: static impedance test, pulse harmonic energy application repair, pulse harmonic acquisition, energy value summation and pulse harmonic energy value adjustment, and finally, the design purpose of eliminating lead sulfate crystals and enabling the impedance of the whole group of batteries to be consistent is achieved. When the static impedance deviation of each monomer of the whole group of batteries is smaller than 3% of the standard static impedance of the normal monomer, the design purpose of eliminating the lead sulfate crystals is considered to be achieved.
The core control unit 110 sends out control pulses to synchronously open the electronic switches KR1+ and KR1-, and applies the special frequency current Ir to the first battery of the whole group of batteries; ir generates corresponding special frequency voltage on the internal resistance of the battery, a voltage signal is connected to a transport amplifier OPA through a band-pass filter BPF, an operational amplifier outputs a final voltage signal Ur to an AD sampling pin of a core control unit 110, the core control unit 110 collects and calculates the voltage signal Ur to obtain a Ur value, and the calculated static internal resistance r of the first battery is obtained. By adopting the same method, the core control unit obtains the static internal resistance of other single batteries of the whole group of batteries by controlling the pulse output and the electronic switch KR.
The beneficial effects of the technical scheme are as follows: different static impedances of all single batteries in the whole group of batteries are obtained through the circuit of the special frequency constant current source static impedance testing unit 100, the special frequency constant current and band-pass operational amplifier module can effectively avoid controlling the influence of power frequency interference on measurement precision, and the core control unit 110 applies different repair energy to all the single batteries according to the different static impedances of all the single batteries.
When repairing lead-acid storage batteries, crystals with different lead sulfate grain sizes have different corresponding resonance frequencies. If a pulse current with a steep front edge is adopted, the frequency analysis is performed by utilizing the Fourier series, so that the pulse can generate rich harmonic components, the amplitude of a low-frequency part is large, and the amplitude of a high-frequency part is small. Thus, the large lead sulfate crystals obtain large energy and the small lead sulfate crystals obtain small energy. The principle of the harmonic pulse oscillation repairing and maintaining technology is that the lead sulfate coarse grains are impacted by using the composite harmonic pulse energy, so that the pulse frequency of the lead sulfate coarse grains and the natural frequency of the lead sulfate crystals generate resonance, when the energy is enough, the lead sulfate crystals which cannot be reduced by charging the storage battery in the actual use environment are crushed and dissolved in sulfuric acid electrolyte to participate in chemical reaction again, thereby prolonging the service life of the battery and improving the safety and reliability of a power supply system.
The invention adopts PWM control output technology through the core unit to generate pulse harmonic waves with different amplitudes and frequencies, the PWM control signal carries out power amplification through the composite pulse harmonic wave restoration unit to generate pulse harmonic waves required by battery restoration, the harmonic waves of control output have large amplitude of low frequency part and small amplitude of high frequency part, and the average frequency of the harmonic waves adopts 8.3kHz. The initial voltage of the pulse harmonic of each cell is related to its own impedance.
The initial voltage of the composite pulse harmonic is obtained according to the following formula:
U0＝r*i0；
wherein r is the static internal resistance measured above, the pulse eliminates the vulcanizing energy requirement (0.01C-0.05C current intensity), and the initial current of the composite harmonic pulse is selected to be i0=0.01C-0.05C.
The core control unit 110 applies different repair energies to each single battery according to the initial voltage of the composite pulse harmonic according to the difference of the static impedance of each single battery.
Referring to fig. 3, the PWM modulated pulse harmonic signal generally comprises 15 repair waveforms, the initial frequency of the harmonic waveform is 7kHz, the amplitude of the harmonic voltage is U0, the frequency is increased to 10kHz after the PWM programming output of the 15 waveforms, and the amplitude is gradually decreased to 0.1U0 after the PWM programming output of the 15 waveforms; the low-frequency part has large amplitude and the high-frequency part has small amplitude, thus realizing the design purpose of crushing lead sulfate crystals with different volumes.
The on-line repairing and balancing control device for the storage battery pack comprises a composite pulse harmonic repairing unit 120 for repairing and time-sharing control of the battery, referring to fig. 3, a core control unit outputs a PWM modulation pulse harmonic signal of a corresponding voltage according to the value of a composite pulse harmonic initial voltage U of a first battery, the PWM modulation pulse harmonic signal is amplified by a power amplification module PA to generate an actual pulse harmonic repairing voltage, synchronously, the core control unit opens repairing switches K1+ and K1-, the pulse harmonic repairing voltage is applied to the first battery, the pulse harmonic current generated by the repairing voltage through the internal resistance of the battery is connected to a signal ground through a sampling resistor Rf, and a pulse harmonic signal If generated by the sampling resistor is output to a dynamic composite pulse harmonic energy testing unit 130.
Further, the core control unit 110 performs pulse composite harmonic repair on different single batteries according to the operation described above, and at the same time, performs composite pulse harmonic energy collection.
Referring to fig. 5, the dynamic composite pulse harmonic energy test unit 130 includes a first-stage integrating operational amplifier circuit and a second-stage integrating operational amplifier circuit. The pulse harmonic signal If is input to one end of a resistor R68 of the dynamic composite pulse harmonic energy testing unit 130, the other end of the R68 is connected with one ends of a C58 and a C62, the other end of the C58 is connected with one ends of a R73 and a C59 to be connected with a syntropy input end 3 pin of a first-stage operational amplifier U12A, the syntropy input end 3 pin is connected to a reference level V_1.25, the other end of the C62 is connected with the other end of the R73 and one end of the R72, and is connected to a reverse input end 2 pin of the first-stage operational amplifier U12A through the other end of the R72, and the 2 pin is connected to the other end of the C59; the reverse input end 2 pin of the first-stage operational amplifier U12A is connected to the output end 1 pin of the first-stage operational amplifier U12A through an integrating capacitor C54 and an amplifying resistor R64 to complete the first-stage integrating amplification of the pulse harmonic signal If, wherein R68 and C58 form a low-pass circuit of the composite pulse harmonic signal, and C62 and R73 form a high-pass circuit of the composite pulse harmonic signal.
The output end 1 pin of the primary integration operational amplifier circuit is connected to one end of a C51, the other end of the C51 is connected to one end of a R63, the other end of the R63 is connected to the reverse input end 6 pin of a secondary operational amplifier U12B, the homodromous input end 5 pin of the secondary operational amplifier U12B is connected to a reference level V_1.25, the reverse input end 6 pin of the secondary operational amplifier U12B is connected to the output end 7 pin of the secondary operational amplifier U12B through an integration capacitor C56 and an amplification resistor R6, the secondary integration amplification of a pulse harmonic signal If is completed, the output end 7 pin of the secondary operational amplifier U12B is connected to a filter capacitor C61 through an R7, and a pulse harmonic signal UIf which can be identified by a core unit after amplification is output.
The beneficial effects of the technical scheme are as follows: the core control unit calculates the current effective value of each waveform of the pulse harmonic according to the pulse harmonic signal UIf measured by the dynamic composite pulse harmonic energy testing unit 130.
After obtaining the current effective value of each point of a composite pulse harmonic wave, integrating the current time to obtain the electric quantity value Q of the current pulse harmonic wave:
Q＝∫i(t)*dt，
where i (t) is a current value of each high-frequency waveform sequentially output by PWM, and dt is a period value of each high-frequency waveform.
For each single battery, the core control unit outputs a composite pulse harmonic wave at regular intervals (for example, 500 ms) for repairing; and applying composite pulse harmonic waves to each single battery of the whole battery in a time sharing way. After a repair period of a period of time (for example, 7 days), the repair electric quantity of each single battery is accumulated, so as to obtain a total electric quantity value QTOTAL of the repair energy of each single battery in the repair period.
Further, according to principles of atomic physics and solid physics, sulfide ions have 5 different energy level states, and ions that are normally in a metastable energy level state tend to migrate to the most stable covalent bond energy level to exist. At the lowest energy level (i.e., covalent bond energy level state), sulfur exists as a ring-shaped molecule comprising 8 atoms, which is a stable combination that is difficult to break up, forming the unpalatable sulfation-sulfidation of the cell. This occurs many times, and a layer of lead sulfate crystals similar to the insulating layer is formed.
To break up the binding of these sulfate layers, the energy level of the atoms is raised to a certain extent, at which time the electrons carried by the outer atoms are activated to the next higher energy band, releasing the binding between the atoms. Each specific energy level has a unique resonant frequency and some energy must be supplied to cause the activated molecule to migrate to a higher energy level state, too low energy to meet the energy requirements for the transition, but too high energy will cause the atoms that have been unbound to transition to be in an unstable state and fall back to the original energy level. Therefore, the ion must be released from the binding by resonance a plurality of times to reach the most active energy state without falling back to the original energy level, and thus, the ion is converted into free ions dissolved in the electrolyte to participate in the electrochemical reaction.
The on-line repairing and balancing control device for the storage battery obtains the total energy of repairing work in one period time of each single cell through the acquisition and calculation of the core control unit, and provides the data for further repairing each single cell.
After a time repair period, the core control unit starts the special-frequency constant-current source static impedance test of each single battery again to obtain the static impedance rb of each single battery after the time repair period. Comparing with the static impedance ra obtained by the previous period test to obtain a static impedance change rate Kr:
Kr＝(rb-ra)/ra。
further, the core control unit compares the static impedance change condition of each single battery, and adjusts the amplitude and the frequency of the composite pulse harmonic voltage applied in the next repair time period according to the reverse ratio characteristic. The reverse ratio characteristic is characterized in that the static impedance change rate Kr is large, the impedance rb is close to the static impedance of a normal battery, and the amplitude of the composite pulse harmonic voltage is reduced; the static impedance change rate Kr is small, the impedance rb is larger than the static impedance of a normal battery, and the amplitude of the composite pulse harmonic voltage is increased.
Repeating the steps of each single battery: static impedance test, pulse harmonic current application repair, pulse harmonic acquisition and energy value calculation, and finally, the aim of eliminating lead sulfate crystals and designing the impedance of the whole group of batteries consistently is achieved. When the static impedance deviation of each monomer of the whole group of batteries is smaller than 3% of the static impedance of the normal monomer, the design purpose of eliminating the lead sulfate crystals is considered to be achieved.
The invention discloses an on-line repairing and balancing control device for a storage battery pack, which comprises the following components: after a certain repair period, after the impedance of each single battery of the whole battery is consistent, the control circuit continuously and time-sharing applies low-amplitude composite pulse harmonic energy to each single battery, so that the lead sulfate recrystallization of each single battery is avoided, the performance consistency of the whole battery is ensured, and the service life of the battery is prevented from being reduced due to lead sulfate crystallization.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1. the special frequency constant current source static impedance test unit realizes static impedance test of the single battery, and according to the test result of the static impedance, different impedance empirical values are referred, and composite pulse harmonic waves with different current energy are applied by the composite pulse harmonic wave repair unit to repair the vulcanization problem of the battery, and synchronously, the dynamic composite pulse harmonic wave energy test unit measures the composite harmonic wave charge energy in a repair time period; after a repairing time period, a special-frequency constant current source static impedance testing unit is further started to conduct static impedance testing, composite pulse harmonic energy of different current units is adjusted according to new testing results of static impedance and dynamic composite pulse harmonic energy comprehensive analysis, the steps are repeated, and balanced repairing of different single batteries of the same battery pack is finally achieved through the closed-loop working process.
2. In the serial repair process, the internal resistances caused by different crystallization degrees of lead sulfate are inconsistent, and the pulse harmonic energy applied by the control circuit is different, so that the low-crystallization single battery is prevented from being excessively repaired, and other elements (polar plates) of the single battery are prevented from being damaged or enlarged; meanwhile, the phenomenon that lead sulfate crystals cannot be broken due to insufficient pulse harmonic energy is avoided, and the design effect cannot be achieved. The on-line repairing and balancing control device for the storage battery pack truly realizes the balanced repairing of different single batteries, and simultaneously realizes reasonable control of energy and avoids excessive energy consumption.
3. After certain repair period, the impedance of each single battery of the whole battery pack tends to be consistent, and the control circuit continuously and time-divisionally applies low-amplitude composite pulse harmonic energy to each single battery, so that the occurrence of lead sulfate recrystallization of each single battery is avoided, the performance consistency and the uniformity of the whole battery pack are ensured, and the reduction of the service life of the battery due to lead sulfate crystallization is avoided.
4. The invention directly measures the repair energy applied by the circuit and the method, adjusts the repair energy intensity in real time according to the change condition of the repair effect after repair for a period of time, avoids energy waste caused by unit voltage or current repair, and realizes the controllability of the repair energy.
5. Other methods of applying fixed harmonic voltages, which are passive application methods, ultimately produce a repair effect that is entirely limited by the battery resistance and cannot form closed loop control. According to the invention, the harmonic frequency and amplitude are controlled and output through PWM and power amplifier, and the frequency and amplitude are regulated according to the repairing effect, so that the passive application of energy is changed into the active control application, and lead sulfate crystals with different volumes and emphasized crystals can be repaired better.
Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program to instruct associated hardware, where the program may be stored on a computer readable storage medium. Wherein the computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, etc.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. The on-line repair and equalization control method for the storage battery pack is characterized by comprising the following steps of:
Starting a special frequency constant current source static impedance test unit to apply special frequency pulse current to each single battery in the storage battery pack in a time-sharing way, and synchronously collecting special frequency voltages at two ends of each single battery in the storage battery pack;
the core control unit obtains the static impedance value of each single battery according to the special frequency voltage and outputs the composite pulse harmonic voltage with different amplitude frequencies in a PWM modulation mode according to the static impedance value of each single battery;
applying the composite pulse harmonic voltage to each single battery in a time-sharing manner to repair each single battery, and synchronously starting a dynamic composite pulse harmonic energy testing unit; and
collecting composite pulse harmonic signals at two ends of each single battery, and counting the harmonic energy of each single battery in the repairing period in a discrete integration mode, wherein the static impedance value change rate of each single battery is compared with the harmonic energy of each single battery in the repairing period, the amplitude and the frequency of the composite pulse harmonic voltage are adjusted, and the battery in the next period is repaired, wherein the comparison of the static impedance value change rate of each single battery and the harmonic energy of each single battery in the repairing period comprises the following steps: the amplitude and the frequency of the composite pulse harmonic voltage are adjusted according to the change rate of the static impedance value of each single battery in the storage battery pack in the repairing period in the following way, wherein when the change rate of the static impedance value is large and is close to the static impedance value of a normal battery, the amplitude and the frequency of the composite pulse harmonic voltage are reduced; and increasing the amplitude and frequency of the composite pulse harmonic voltage when the static impedance value change rate is small and greater than the static impedance value of a normal battery.
2. The on-line repair equalization control method of the storage battery pack according to claim 1, wherein after a certain repair period, after the static impedance values of all the single batteries in the storage battery pack are consistent, the low-amplitude composite pulse harmonic voltage is continuously applied to all the single batteries in a time sharing mode, the occurrence of lead sulfate recrystallization of all the single batteries is avoided, and the performance consistency of all the single batteries in the storage battery pack is ensured.
3. An on-line repair and equalization control device for a storage battery pack is characterized by comprising:
the special frequency constant current source static impedance testing unit is used for applying special frequency pulse current to each single battery in the storage battery pack in a time-sharing way and synchronously collecting special frequency voltages at two ends of each single battery in the storage battery pack;
the core control unit is used for starting the special frequency constant current source static impedance testing unit, obtaining the static impedance value of each single battery according to the special frequency voltage and outputting composite pulse harmonic voltages with different amplitude frequencies according to the static impedance value of each single battery in a PWM modulation mode;
the composite pulse harmonic wave repairing unit is used for applying the composite pulse harmonic wave voltage to each single battery in a time-sharing manner so as to repair each single battery, and synchronously starting the dynamic composite pulse harmonic wave energy testing unit; and
The dynamic composite pulse harmonic energy testing unit is used for collecting composite pulse harmonic signals at two ends of each single battery, counting the harmonic energy of each single battery in a repairing period in a discrete integration mode, wherein the core control unit is further used for comparing the change rate of the static impedance value of each single battery with the harmonic energy of each single battery in the repairing period of the period, adjusting the amplitude and the frequency of the composite pulse harmonic voltage, and repairing the battery in the next period, wherein the core control unit is used for calculating the static impedance value of each single battery in the storage battery according to the specific frequency voltage and the specific frequency pulse current, generating composite pulse harmonic voltages with different frequency voltage amplitudes in a PWM (pulse width modulation) mode according to the change rate of the static impedance value in the repairing period, and outputting the composite pulse harmonic voltages to the composite pulse harmonic repairing unit, wherein when the change rate of the static impedance value is large and is close to the static impedance value of a normal battery, the amplitude and the frequency of the composite pulse harmonic voltages are reduced; and increasing the amplitude and frequency of the composite pulse harmonic voltage when the static impedance value change rate is small and greater than the static impedance value of a normal battery.
4. The on-line repair and equalization control device of a storage battery pack according to claim 3, wherein the characteristic constant current source static impedance test unit comprises a characteristic constant current source module and a band-pass operational amplifier module, a first output end and a second output end of the characteristic constant current source module are respectively connected with a first input end and a second input end of the band-pass operational amplifier module, wherein,
the first output end of the special-frequency constant current source module and the first input end of the band-pass operational amplifier module are connected with the positive electrode of each single battery in the storage battery pack through a first group of electronic switches; and
the second output end of the special frequency constant current source module and the second input end of the band-pass operational amplifier module are connected with the cathodes of all the single batteries in the storage battery pack through a second group of electronic switches, and the positive-electrode side electronic switches in the first group of electronic switches are in one-to-one correspondence with the negative-electrode side electronic switches in the second group of electronic switches.
5. The apparatus of claim 4, wherein the special frequency constant current source module comprises a constant current source and a switching transistor, wherein,
the positive electrode of the constant current source is connected to the source electrode of the switching transistor, and the negative electrode of the constant current source is used as the second output end of the special frequency constant current source module and is used for generating current with specific amplitude and frequency;
And the grid electrode of the switching transistor is connected with the core control unit, and the drain electrode of the switching transistor is used as the first output end of the special frequency constant current source module, wherein the switching transistor is turned on or off according to a pulse control signal received by the grid electrode, so that the switching transistor generates special frequency pulse current.
6. The battery pack online repair equalization control device of claim 4, wherein said band pass op-amp module comprises a band pass filter and a first op-amp, wherein,
the band-pass filter is used for allowing the special frequency voltage to pass and shielding other frequency band voltages; and
the first operational amplifier is configured to amplify the turbo voltage and provide the amplified turbo voltage to the core control unit.
7. The apparatus of claim 3, wherein the composite pulse harmonic repair unit comprises a second operational amplifier, a first group of repair switches, a second group of repair switches corresponding to the first group of repair switches, and a sampling resistor,
the second operational amplifier is used for amplifying the composite pulse harmonic voltage;
Each single cell in the storage battery pack is connected in series between the second operational amplifier and the sampling resistor in a time-sharing manner via the first group of repair switches and the second group of repair switches to time-share apply an amplified composite pulse harmonic voltage to each single cell, wherein the positive electrode side repair switches in the first group of repair switches and the negative electrode side repair switches in the second group of repair switches are in one-to-one correspondence.
8. The on-line repair equalization control device of a storage battery pack according to claim 7, wherein,
the dynamic composite pulse harmonic energy testing unit is used for measuring dynamic pulse harmonic current values applied to all the single batteries, and carrying out integral amplification on the dynamic pulse harmonic current values and converting the dynamic pulse harmonic current values into dynamic pulse harmonic voltage values;
the core control unit is further used for calculating current effective values of all points of the dynamic pulse harmonic according to the dynamic pulse harmonic voltage value and the sampling resistor, and carrying out integral calculation on the current effective values to obtain the harmonic energy of the dynamic pulse harmonic applied at this time; in the repairing period, after a fixed time interval is passed, dynamic pulse harmonic waves are applied for a plurality of times to repair each single battery, and after the set repairing period time is reached, harmonic energy of each single battery of the dynamic pulse harmonic waves applied for a plurality of times in the repairing period is summed up again, so that the total harmonic energy of each single battery in the repairing period is obtained; and acquiring the special frequency voltage at the two ends of each single battery again according to the special frequency constant current source static impedance test unit, and acquiring the static impedance value of each single battery after one repair period according to the acquired special frequency voltage so as to calculate the change rate of the static impedance value of each single battery after one repair period.
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| CN114236242A (en) * | 2021-11-23 | 2022-03-25 | 广西电网有限责任公司北海供电局 | Accumulator internal resistance tester and testing method based on composite frequency |
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